Schedule DOM reset after column size setting (#9011)

Otherwise, the initial row height state update partly negates
an earlier optimization for unnecessary column width calculation.

client/src/main/java/com/vaadin/client/connectors/grid/GridConnector.java

@@ -338,7 +338,9 @@ public class GridConnector extends AbstractListingConnector
             getWidget().getEscalator().getFooter()
                     .setDefaultRowHeight(rowHeight);
         } else if (getWidget().isAttached()) {
-            getWidget().resetSizesFromDom();
+            // finally to make sure column sizes have been set before this
+            Scheduler.get()
+                    .scheduleFinally(() -> getWidget().resetSizesFromDom());
         }
     }